Fish have mechanoreceptors along the sides of their body called
a. a lateral line system
b. a bilateral system
c. a radial line system
d. setae

Organisms within a population must compete for resources to survive

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

What factors contribute to the effect an environmental toxin has on the human body?